Summary For auditory integration (AI) therapy, the largest body of literature relates to its use in autism. Several systematic reviews of AI therapy in the treatment of autism found limited evidence to support its use. No comparative studies were identified that evaluated the use of AI therapy for other conditions.
The actual cost to install a gas fireplace may vary depending on your location, the product selected, complexity of the installation process, additional accessories purchased, and other options. 1  Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. Top vented gas fireplace inserts cost $750 to $3,000, and installation adds another $500 to $1,000. 2  Direct-vent gas fireplaces cost $1,000 to $3,500, plus $500 to $1,000 for installation.
Cost saver tip: Switch to a simpler surround and mantle, and get a direct-vent fireplace so you donât need a chimney. Hiring a professional to install a gas line or a connection to a propane tank adds about $1,000. #3 Electric Is Your Least-Expensive Option. A gel-fuel fireplace or an electric fireplace starts under $400. With a portable unit, thatâs the total cost since the fireplace is ready to use once you remove the packaging. Because thereâs no flue or chimney, itâs easy to install TVs or other electronic gear directly above an electric fireplace.